Fix #2326

Author: cowtowncoder

release-notes/VERSION-2.x

@@ -20,6 +20,7 @@ Project: jackson-databind
  (reported by Cyril M)
 #2324: `StringCollectionDeserializer` fails with custom collection
  (reported byb Daniil B)
+#2326: Block one more gadget type (CVE-2019-12086)
 - Prevent String coercion of `null` in `WritableObjectId` when calling `JsonGenerator.writeObjectId()`,
   mostly relevant for formats like YAML that have native Object Ids
 

src/main/java/com/fasterxml/jackson/databind/jsontype/impl/SubTypeValidator.java

@@ -80,6 +80,9 @@ public class SubTypeValidator
         s.add("org.apache.openjpa.ee.JNDIManagedRuntime");
         s.add("org.apache.axis2.transport.jms.JMSOutTransportInfo");
 
+        // [databind#2326] (2.9.9): one more 3rd party gadget
+        s.add("com.mysql.cj.jdbc.admin.MiniAdmin");
+
         DEFAULT_NO_DESER_CLASS_NAMES = Collections.unmodifiableSet(s);
     }